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Exploring the K’NEX balance model
 • Replacethehangingtrayssothattherearetwopulleys
on one side and one on the other side. Push both
hanging trays to the end of their arms and observe,
record and explain what happens.
 • Posethequestion,“Whatdoyouhavetodotobalance
the forces in the model?”
Teacher’s Notes
The children should note that the
heavier tray goes down while the
lighter tray moves up. They should
also report that this is the result of
unbalanced forces in action.
The children may either add, or
remove, a grey pulley to one or the
other side in order to make the weights
on both sides equal. The children
should be encouraged to discuss their
observations in terms of balanced and
unbalanced forces.
 • Askthechildrentoreturntotheir‘unbalanced’model
with two grey pulleys on one side and one on the other
to find a different way to balance their model without
adding or removing grey pulleys. They can slide the
hanging trays along the arms.
The children should be able to find
that by sliding the heavier hanging
tray closer to the fulcrum, the balance
model will again become balanced.
Discuss the children’s findings
with those obtained in a previous
investigation of the K’NEX Seesaw
(Lesson 2.2: Making lifting and moving
easier) in which they discovered that
a small effort applied a long distance
from the fulcrum can be used to lift
a heavier load positioned close to
the fulcrum.
Whole Class
 • Askthechildreniftheirresultsmightsuggestageneral
rule for making a balance work.
 • Discusswiththeclass
  •Howwilltheytesttheirrule?
  •Whatwilltheymeasure?
  •Howmanyreadingsdotheyneedtotake?
  •Howwilltheyrecordtheirresults?
If time permits, each group could
work individually. Alternatively, the
class could share results leading to
a general class discussion on their
interpretation.
You may also decide to suggest that
the children use a table template, such
as the one shown on Page 24, in which
to record their results.
levers and pulleys
website: www.knexeducation.co.uk
Lesson 3: The Balance
Education
®
24


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